// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_HISTOGRAM_SUBSCRIBER_H_
#define CONTENT_BROWSER_HISTOGRAM_SUBSCRIBER_H_

#include <string>
#include <vector>

namespace content {

// Objects interested in receiving histograms derive from HistogramSubscriber.
class HistogramSubscriber {
public:
    virtual ~HistogramSubscriber() { }

    // Send number of pending processes to subscriber. |end| is set to true if it
    // is the last time. This is called on the UI thread.
    virtual void OnPendingProcesses(int sequence_number,
        int pending_processes,
        bool end)
        = 0;

    // Send |histogram| back to subscriber.
    // This is called on the UI thread.
    virtual void OnHistogramDataCollected(
        int sequence_number,
        const std::vector<std::string>& pickled_histograms)
        = 0;
};

} // namespace content

#endif // CONTENT_BROWSER_HISTOGRAM_SUBSCRIBER_H_
